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Prefrontal cortical GABA modulation of spatial reference and working memory.

Meagan L Auger1, Stan B Floresco2

  • 1Department of Psychology, University of British Columbia, 2136 West Mall, Vancouver BC, Canada (Drs Auger and Floresco).

The International Journal of Neuropsychopharmacology
|January 2, 2015
PubMed
Summary
This summary is machine-generated.

Reducing prefrontal cortex (PFC) GABA signaling severely impairs spatial memory and short-term recall in rats. These findings suggest PFC GABA dysfunction contributes to cognitive deficits seen in schizophrenia.

Keywords:
GABAprefrontal cortexreference memoryschizophreniaworking memory.

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Area of Science:

  • Neuroscience
  • Cognitive Science

Background:

  • Prefrontal cortex (PFC) GABA transmission dysfunction is linked to cognitive deficits in schizophrenia.
  • The precise role of PFC GABA in regulating cognitive and mnemonic functions is not fully understood.

Purpose of the Study:

  • To investigate the impact of reduced GABAA signaling in the rat medial PFC on spatial reference and working memory.
  • To determine if PFC GABA influences susceptibility to proactive interference using a radial-arm maze task.

Main Methods:

  • Pharmacological reduction of GABAA signaling in the medial PFC of rats using bicuculline.
  • Assessment of spatial reference/working memory using radial-arm maze tasks with massed trials.
  • Comparison with PFC inactivation using GABA agonists (baclofen/muscimol).

Main Results:

  • GABAA receptor antagonist bicuculline significantly increased working and reference memory errors and response latencies.
  • PFC inactivation with GABA agonists did not affect reference or working memory.
  • PFC GABAA antagonism primarily impacted complex spatial tasks, with minimal effects on simple discrimination.

Conclusions:

  • Prefrontal GABA hypofunction severely disrupts spatial reference and short-term memory.
  • Disinhibition of the PFC can impair memory processes not typically reliant on frontal lobes.
  • These PFC GABA-related memory impairments mirror those in schizophrenia, implicating PFC GABA signaling in the disorder's cognitive deficits.